chmod
Change Access Permissions
chown
Chang Owner
yum
Install/remove software (RedHat)
ls
Listing file system objects
pwd
Print current directory
cd
Change directories
cat
Create, view or link files
nano
Text editor
mv
Move files
cp
Copy files
rm
Delete (remove) files
df
Displays amount of free disk space
ping
Tests hosts reachability on IP based network
dig
DNS records
passwd
Change or reset password